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k%j KLEINFELDER <br /> r <br /> File No. 20-2949-13 <br /> November 26, 1990 <br /> On October 23 , 1990, our representative returned to the <br /> site to perform the 3-foot deep percolation test. As per <br /> San Joaquin County guidelines, the test was performed <br /> for a period of 4 hours. The last 30 minutes of the test <br /> were used to calculate the percolation rate. In order <br /> to use standard leach lines, the County requires a <br /> percolation rate of 60 minutes per inch, or faster, at <br /> the 3-foot depth. The 3-foot deep test performed passed <br /> with a percolation rate of 60 minutes per inch. The <br /> county approved percolation test sheet is included with <br /> this report. <br /> ITEM C-3: <br /> "The depth and gradient of the groundwater table. " <br /> During our residence surveys on October 11, 1990, we were <br /> able to measure groundwater in 3 wells. The groundwater <br /> was measured at between 14 and 16 feet below existing <br /> ground surface. Regional groundwater maps published by <br /> the San Joaquin County Flood Control and Water <br /> Conservation District, Plate II, do not indicate the <br /> depth to groundwater in this area. <br /> Based on County requirements for a small single parcel <br /> split, we are not required to establish an on-site <br /> groundwater gradient by drilling test borings. We are <br /> providing a general estimate of the groundwater gradient <br /> based on the published maps. Based on the groundwater <br /> map showing lines of equal elevation of groundwater, <br /> Plate III, we conclude that the main groundwater gradient <br /> is in roughly the north to northeast direction. <br /> Copyright 1990 C einfelder, Inc. 3 <br />